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Mechanical Engineering Objective Questions { Refrigeration and AC }



78. The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will
A.Increase
B.Decrease
C.May increase or decrease depending on the type of refrigerant used
D.Remain unaffected

79. Which of the following refrigerants has lowest freezing point
A.Freon-12
B.NH3
C.CO2
D.Freon-22

80. The COP of a vapour compression plant in comparison to vapour absorption plant is
A.More
B.Less
C.Same
D.More/less depending on size of plant

81. The C.O.P. of a domestic refrigerator in comparison to domestic air conditioner will, be
A.Same
B.More
C.Less
D.Dependent on weather conditions

82. The evolution of heat of solution takes Place in ammonia absorption plant when
A.Ammonia vapour goes into solution'
B.Ammonia vapour is driven out of solution
C.Lithium bromide mixes with ammonia
D.Weak solution mixes with strong solution

83. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.
A.More
B.Less
C.Equally.
D.Unpredictable

84. Presence of moisture in a refrigerant affects the working of
A.Compressor
B.Condenser
C.Evaparator.
D.Expansion valve

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